This Shaw Barrels Titanium Sleeve Spiral Fluted Barrel Blank features a spiral flute Titanium tension sleeve over a 416R Stainless core. The outer Titanium sleeve is polished to give your rifle a clean, finished look. Features1.200" O.D. Straight Shank - 2.700" LongTaper from 1.200" to 1.000" - 2.250" Long1.000" O.D. to muzzle NotesUse shims for timing muzzle devices. No crush washers.Do not exceed 40 ft/lbs. muzzle device torque.Do not attempt to disassemble forward locking nut.Do not subject the Ti sleeve to clamping forces.