This is the Du-Bro EZ Mount Cowl System for .90 and Above Size Aircraft.
Provides an easy way to mount your cowl while protecting the painted surface of your cowl "Soft-Shock Bushings" reduce vibration and will not mar the surface
1/16 in. Allen Wrench
3/32 in. Drill for Hard Wood/Plywood
5/64 in. Drill for Soft Wood/Plywood