Heavy duty aluminum alloy scuba diving back plate with 4 pieces book screws for backplate , tough, high strength, strong corrosion resistant, wear-resistant and durable Perimeter 7/16" side holes for mounting lights, tank bottles, lift bags and other accessories Slots to accept directly threaded cam belt bands for single tank diving Slots for crotch straps, universal fits 1" and 2" standard webbing Great gear equipment for technical scuba diving and divers Specification: Scuba Diving Backplate Material: Matt anodized aluminum alloy Size (L x W): Approx. 39.7 x 26.2 cm/15.6" x 10.3" Slot Length: Approx. 5.3 cm/2" Hole Inner Diameter: Approx. 1.1 cm/7/16" Thickness: Approx. 3 mm Color: Silver Dive Backplate Book Screws Material: Marine grade chrome-plated brass Length: Approx. 1.7 cm/ 0.7 inch Diameter: Approx. 1.9 cm/0.74 inch Quantity: 4 Pieces Package Includes: 1 Piece Scuba Diving Back Plate 4 Pieces Scuba Dive Backplate Book Screws Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!