The HSS Drill Bits in this 7 piece set are gripped by a spring steel collet into the hex shaft.

The hex shanks snap into the Quick Chuck.

Contents.

1.6 mm (1/16in) Drill.
2.4 mm (3/32in) Drill.
3.2 mm (1/8in) Drill.
4.0 mm (5/32in) Drill.
4.8 mm (3/16in) Drill.
5.6 mm (7/32in) Drill.
6.3 mm (1/4in) Drill.
With collets.

Snappy HSS Drill Bits are gripped by a spring steel collet into Hex Shaft. The Hex shanks snap into the quick chuck.