- Made from Hi grade steel.
- Heat treated.
- Quick & easy way to remove broken screws, pipes, bolts & studs.
- Applicable for drill size: No.1 7/64", No.2 9/64", No.3 5/32",No.4 1/4", No.5 19/64", No.6 13/32", No.7 17/32", No.8 13/16".
- Capacity: No.1 1/8"-1/4", No.2 1/4"-5/16",No.3 5/16"-7/16", No.4 7/16"-9/16", No.5 9/16"-3/4", No.6 3/4"-1" ,No.7 1"-1 1/8" , No.8 1 1/8"-1 1/4".