Wrench adapted from Remington factory design, with pilot that keeps "teeth" square to the forend nut, virtually eliminating damage to wrench, forend or forend nut. But, if one of the wrench teeth should ever break, turn the "sleeve" around, there’s another set. Models for Rem. 870 or Mossberg 500. Mfg: Brownells SPECS: Steel. 12 Gauge 6 3/4" (17.1cm) long overall. 5" (12.7cm) long handle. 20 Gauge 7-7/8" (20cm) long overall. 5" (12.7cm) long handle. Replacement Sleeve for 12 gauge only; sold 1 each.