Stadea Series Super A - ADC107K 1/2" Hexagonal shank to 1 1/4" 7 threaded male thread adapter made with twist resistant Hardened Alloy for hand and power tools such as hand drills, core drills, power drills. Connects to 5/8" 11 Female Threaded Core Bits / Tools, Overall threaded length 1-1/4". Opens 1/2" Hexagonal Shank Hexagonal Shank can be use to Connect to Compatible Power Tools and Hand Tools It enables manual or power hand tools that takes 1/2" hexagonal shank to use tools or core bits with 1 1/4" 7 female threads. The one side of the adapter - the triangle shank connects to the power tool, the other sides of the adapter 1 1/4" 7 male threaded connects 1 1/4" 7 female threaded tools such as Core drill bits, Hole saws Profile wheels Cup grinding wheels Other compatible tools