No drill requires, using four allen screw to secure the holder.
The Holder can be mounted at front or at back, and can be transformed for one side holding or two side holding.
Made by Stainless Steel
holding for 3 1/8 inch (8cm) drinking cup size.
Mounting front total size: depth 5 1/8 x width 7 1/2 inch (13cm x 19cm).
Photos show possible mounting on Porsche 911
Click of Installation Instruction
2910 E. Miraloma Ave Suite B Anaheim CA 92806 USA