Description: Heavy duty technical scuba diving back plate with single tank adapter and 4 pieces brass book screws for backplate Perimeter 7/16" side holes on backplate 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 The single tank adapter is perfect for scuba divers switch their harness system between double and single tank rigs or between back mount and side mount configurations Tough, high strength, strong corrosion resistant, wear-resistant and durable Great gear equipment accessories 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 Scuba Diving Single Tank Adapter for Backplate Material: Marine garde 316 stainless steel Size (L x W): Approx. 30.4 x 6.6 cm/12" x 2.6" Center Hole to Hole size: Approx. 28cm/11" Slot Length: Approx. 5.3 cm/2" Thickness: Approx. 2 mm Color: Silver Dive 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 Backplate 1 Piece Scuba Diving Single Tank Adapter for Backplate (with screws nuts washers) 4 Pieces Dive Book Screws Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!