(1)Size: 1/4"(6mm), 5/16"(8mm), 3/8"(10mm), 1/2"(12mm), 5/8"(16mm), 3/4"(20mm), 7/8"(22mm), 1"(25mm), 1/4"(6mm), 1-1/4"(32mm), 1-1/2"(38mm), 2"(50mm)
(2)Material: Cr-V; 65Mn Alloy Steel; Drop-Forged 55# Carbon Steel
(3)Surface Treatment: Machine Grinding