<p>The in-cut crimps are the most positive crimps in the range. They offer an extremely positive edge on wall angles between 30 and 60 degrees, beyond this they can be used on roofs, but will be more challenging.<br />There are two central holds: one with a concave profile, the other with a convex profile: Two left and two right-handed holds, marked L and R, respectively.<br />They can be either bolted or screwed on to the climbing wall.</p>