rulie
Head Pro
However, as discussed previously, they make the hole smaller than the Rules-required 4 1/4 inches, ie, non- conforming.You have the sloping face on the inside. The problem arises when the sloping face is on the outside.
If the point is at the top there will be a gap between the lip and the top of the collar.
They should only be used if the edge of the hole is prone to crumbing. Not simply than it is easier than painting.
Normal earth better absorbs the energy of the moving ball than the harder plastic of the inserts when placed at lip height.