Wera 05104650001 846 8 3 flute countersink bits set wera 05104650001 this set from wera includes 1 kraftform quick release bitholding screwdriver 1 rapidaptor universal bit holder suitable for use with power tools and electronic drills and 6 countersink bits with 1 4in drive wera 05104650001 846 8 3 flute countersink bits set