5-8 x 24 Compatible Calibers:.308, 45 ACP, 40, 30-30, 30-06, 300, 333 Lapua, 6.5 Grendal 1-2 x 28 Compatible Calibers:.22, 9mm, 17HMR, 5.7x28, 5.56, .223,.243,.270 Outer Diameter: 1.063" , Inner Diameter: 7/8" , Overall Length: 6.00" Very popular with Ruger 10/22 and other .22LR owners,Suitable for long-term work in the automotive fuel environment. Stainless steel has higher hardness and wear resistance than aluminum, stainless steel will not be corroded..syi