VISM 30mm Tactical Rings/0.9In Height Black. Removable 1 inch inserts make these Riflescope Rings from VISM useable with both 30mm and 1 inch diameter Rifle Scope tubes. VISM 30mm Tactical Rifle Scope Ring Sets are made of black anodized aluminum. Use VISM Tactical 30mm Rifle Scope Rings to mount the Rifle Scope of your choice. Specifications for VISM Tactical Rifle Scope Rings 30mm: Set of two 0.9 inch rings: 1.8 inch overall height 2.1 ounce weight Set of two 1.1 inch rings: 2.1 inch overall height 2.3 ounce weight Set of two 1.3 inch rings: 2.2 inch overall height 2.4 ounce weight Set of two 1.5 inch rings: 2.4 inch overall height 2.5 ounce weight Package Contents: VISM Tactical Rifle Scope 30mm Rings Mounting tool VISM VR30T09: 30mm Tactical Rings/0.9In Height Black