Klatregrepet er såpass lite at hånden ikke har plass.

Because Norwegian very often makes compound nouns by joining words together.

• klatre = climb / climbing
• grep = grip / hold

So klatregrep means climbing hold, and klatregrepet means the climbing hold.

This is much more natural in Norwegian than writing it as separate words.

Klatregrepet is the definite form: the climbing hold.

• et klatregrep = a climbing hold
• klatregrepet = the climbing hold

Norwegian usually adds definiteness as an ending on the noun rather than using a separate word like English the.

Because grep is a neuter noun.

• et grep = a grip / hold
• neuter singular adjective form = lite

So:

• et lite grep
• klatregrepet er lite

If the noun were a common-gender noun, you would expect liten instead.

Såpass means something like:

• so
• this much
• to such an extent
• quite / rather, depending on context

In this sentence, it helps create a result idea: the hold is so small / small to that extent that the next thing happens.

So såpass lite at ... is roughly so small that ...

Here at means that and introduces a subordinate clause showing the result.

Structure:

• såpass lite
• at hånden ikke har plass

So the pattern is:

• so + adjective + that ...

Very common in Norwegian:

• Den er så stor at ... = It is so big that ...
• Det er så kaldt at ... = It is so cold that ...

Because at hånden ikke har plass is a subordinate clause.

In Norwegian subordinate clauses, the normal word order is:

• subject + ikke
  • verb

So:

• hånden ikke har

Compare that with a main clause:

• Hånden har ikke plass.

This is a very important word-order difference in Norwegian.

Har plass means has room / has space.

It is a very common expression in Norwegian. In this sentence it means there is not enough physical space for the hand.

So hånden ikke har plass is basically the hand does not have room.

Because plass here is being used in a general, uncountable sense: room / space.

Norwegian often uses nouns without an article in expressions like this:

• ha plass = have room
• ta plass = take up space
• gi plass = make room

So ikke har plass is the natural idiomatic wording.

Hånden is the definite singular form, meaning the hand.

A few useful points:

• hånd can appear with different definite forms depending on style and dialect
• hånden is a standard Bokmål form
• some speakers may also use forms like handa in other varieties

Also, Norwegian often uses the definite form of body parts where English might use a possessive:

• Norwegian: Han løftet hånden
• English: He raised his hand

So hånden can naturally mean the hand in form, but the hand / your hand / one’s hand in context.

Because the sentence is talking about whether a hand can fit on the hold. Singular is enough and sounds natural.

Norwegian often uses singular body-part nouns in this kind of physical description when one body part is being considered as representative:

• Hånden får ikke plass = the hand does not fit / there is no room for the hand

It does not necessarily mean only one specific hand matters; it is just the natural way to phrase it.

Yes. That would also be correct.

The difference is that såpass adds a slight nuance of to that degree / that much. It can make the sentence feel a bit more measured or natural in some contexts.

So:

• så lite at ... = so small that ...
• såpass lite at ... = so small, to that extent, that ...

Both work, but såpass adds a little extra emphasis or shading.

Yes, it is natural Norwegian.

The sentence sounds like a descriptive explanation of size and consequence:

• the climbing hold is small
• therefore the hand does not have room

A speaker might also say things like:

• Klatregrepet er for lite for hånden
• Det er ikke plass til hånden på klatregrepet

But the original sentence is perfectly normal and idiomatic.