3/8" Dia. Mini Solid Carbide Boring Bar, DCMT 21.51, Right Hand

0.375" shank with a ground clamping flat, 4.000" overall length, 93° lead angle. Bores from 0.492" diameter. DCGT inserts of the same size also fit. No through-coolant; Torx clamping screw included, T-8 key not. The carbide shank is about three times stiffer than steel and holds size at overhangs where a steel bar chatters.