Peak Design bolt pack

One pair of thumb-drive bolts that clamp to any strap up to 1.5 cm (0.6 inches) thick and one pair of hex-drive bolts that clamp to any strap up to 1.6 cm (0.7 inches) thick. Thumb-drive bolts allow easy clamping and unclamping. Hex-drive bolts are for more secure or permanent installation or thicker straps. Thumb-drive bolt length: 0.2 cm (0.8 inches) with a head diameter of 18 cm (0.7 inches). Hex-drive bolt length: 0.22 cm (0.88 inches) with a head diameter of 0.115 cm (0.45 inches). Shaft diameter (both types): 4.9 mm (0.2 inches), M5 (31.8) TP.