No. 0 - 1/4": Tap Size; Taps No. 0 to 1/4 in (3mm to 6mm): Used With. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

1/4" - 1/2": Tap Size; Taps 1/4" to 1/2" (6mm to 12mm): Used With. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

1/4" - 1/2": Tap Size; Taps 1/4" to 1/2" (6mm to 12mm): Used With. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

1/4 - 1/2": Tap Size; Taps 1/4" to 1/2" (6mm to 12mm): Used With. Adjusted and tightened to size by twisting knurled nut.

Taps No. 0 to 1/4" (3mm to 6mm): Used With; No. 0 - 1/4" Tap Size. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

Taps 1/4" to 1/2" (6mm to 12mm): Used With; No. 1/4 - 1/2" Tap Size. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

Taps 1/4" to 1/2" (6mm to 12mm): Used With; 1/4 - 1/2" Tap Size. Designed for use with taps, reamers, screw extractors and other tools with a square shank.

1.6 - 6.35 mm, 1/16 - 1/4": Tap Size; 6" Overall Length. Round shanks can be gripped, but care must be used.