Engineer PA-07 Wire Stripper strips both stranded copper wire AWG24~AWG12 (SWG25~SWG13) & solid copper wire AWG22~AWG10 (SWG23~SWG12) exceptionally sharp & precise carbon steel jaws clean edge to the insulation strip, with no damage to the copper conductor wires (unlike most automatic wire strippers) spring loaded for easy operation (handles latch shut for storage). oil-resistant TPR (thermoplastic rubber) grips for unmatched comfort