Scuba Choice 12-in-1 Scuba Tool Master Stainless Steel Dive Tool Open-ended wrenches: 1/2, 9/16, 5/8, 11/16, 13/16, 15 mm Screwdrivers: 1/8, 1/4 flat, #1 Philips Allen wrenches 3/16, 5/32.