Multi-functional Universal Tool Kit Storage Box Screwdriver Rack DIY For ESC Motor FPV RC Drone Description Material: Acrylic Suitable for most hex screwdriver sets, the hole diameter is 20/23mm, can put RC parts, such as screws. Package Included 2 x Holes Fixed Plate (Transparent)1 x Bottom Board (Black)4 x Aluminum Fixed Column 4 x 10mm Dia. Nylon Pad 7 x M3 Screw 1 x Screw Nut