Q LLC Erect9r Three-Way Mount Black Fits HK 3-Lug Mount for ERECT9R 9mm Suppressor. OVERALL SPECS:DIAMETER: 1.13 in. WEIGHT: 0.135 lbs. OVERALL LENGTH: 1.95 in. ATTACHMENT: H&K TYPE TRI-LUG BARRELS AND MOUNTSMATERIALS(S): 17-4 STAINLESS STEEL AND 7075 ALUMINUMFINISH: AS HEAT TREATED AND HARD COAT ANODIZE RESPECTIVELY Specifications for Q HK 3-Lug Mount for ERECT9R 9mm Suppressor: Manufacturer: Q Fabric/Material: 17-4 Stainless Steel Barrel Material: Stainless Steel Package Contents: Q HK 3-Lug Mount for ERECT9R 9mm Suppressor Q ACCE9MOUNTTRILUGBLACK: LLC ACCE9MOUNTTRILUGBLACK Erect9r Three-Way Mount Black Fits HK 3-Lug Mount for ERECT9R 9mm Suppressor