6pc Jumbo Hex Key Wrench (Sizes: 1/2", 9/16", 5/8" & 12mm, 14mm and 17mm), WRHK-03S & WRHK-03M - Sold by Ucosltore Only Heat treated extruded alloy steel Black oxide finish for durability Jumbo size for large hex nuts and bolts Ideal for trucks, tractors, machinery, and construction Sizes: 1/2", 9/16", 5/8" & 12mm, 14mm and 17mm