This is not a mounting bracket itself. It is just a spacer between an actual bracket and a wall. The spacer provides better control over the distance from a cabinet back panel to a wall. 

The hole for the screw is 8mm. 

There are 4 different lengths of the spacer:

• XS - for gaps from 20 to 30mm
• S for 25-40mm
• M for 50-85mm
• L for 100-180mm