Rolson-30321-39-piece-Quick-Change-Drill-&-Bit-Set-ROLSON-30321-The-Rolson-Tools-30321-quick-change-drill-set-allows-the-user-to-drill-a-pilot-hole-&-countersink-it-with-one-end-of-the-reversible-tool-&-then-nbsp-to-fasten-nbsp-the-fixing-into-the-prepared-hole-with-the-other-end-The-reversible-bit-is-held-in-a-quick-release-collet-chuck-Quick-Change-Drill-&-Bit-Set-39pc