Swanlake headset for 3/8" impact wrench. Heads are forged from heat treated chrome vanadium steel. Coated with a black phosphate anti-corrosion compound. Includes: wrench handle, 3" and 6" extensions, PTO joint, 1/2 to 3/8" adapter. Head ranges: metric deep 8-22 mm; inch deep 5/16 - 3/4 inch; metric shallow 8-22 mm; inch shallow 5/16 - 3/4 inch. Laser size markings on each head for easy selection. Heads in plastic cases with compartments for each size, size also indicated on the compartment. The Hexagonal head profile provides secure contact with fasteners and prevents stripping. This is a high-quality professional tool for a wide range of locksmithing applications.