137828 Model：N/A Quantity：1 piece(s) per pack Color：Black Material：Aluminum alloy Specification：Suitable for 20mm guns Packing List：1 x Gun rail mount 1 x Hex wrench Dimensions: 4.49 in x 0.79 in x 0.47 in (11.4 cm x 2.0 cm x 1.2 cm) Weight: 1.34 oz (38 g)