The HSS drill bits are gripped by a spring steel collet into the hex shaft. The hex shanks snap into the quick chuck. The hex collar is supplied in the sets to enable drills to be removed with two spanners. 7 piece drill set. 1.5, 2, 2.5, 3, 4, 5 and 6mm. Supplied in a storage tube. https://elecena.pl/product/27169491/trend-snap-hd-set-drill-set-7-piece 2024-11-07 https://elecena.pl/product/27169491/trend-snap-hd-set-drill-set-7-piece 2025-09-09