Restorer for external thread 4-13 mm | 5/32 inch - 1/2 inch (60° M, MF, UNC, UNF, UN, NPT)" thread adjuster male thread 4 - 13 mm & 5/32 inch - 1/2 inch (60° M, MF, UNC, UNF, UN, NPT) | M 4 - M 13 | 5/32 - 1/2 inch | For threads with flank angle 60°: M - metric ISO standard thread | MF - metric ISO fine thread | UNC - American unified coarse thread | UNF - American unified fine thread | UNEF - American unified extra fine thread | US / UN - American unified thread with special pitch (8-UN, 1 2-UN, 1, 16-UN) | BSC - British bicycle thread | Advantages: - Reconstructs the old thread without changing it - Removes rust - Hardened cutting blades - Cuts the old thread at the head start - Independent thread pitch - Clockwise and anti-clockwise rotation - No calibration necessary - No measuring of the thread required