4mm 4mm Long Wood Drill, Extra Lange Bohrer, HSS Twist Drill Bits with Straight Shank for Hard Metal, Stainless Steel, Cast Iron and Other Hard Materials, 1 Piece: Amazon.com: Tools & Home
BGS Bohrer-Satz TLG 6801, HSS Drill bit Set, 10-11-12-13-15 mm, 5 Pieces - - Amazon.com
Black & Decker - Piranha Bullet Drill Bit (1) 4.0mm - Drill Bits - Amazon .com
Bosch 2608585872 Din338 HSS-Co Metal Drill Bit, 1mm x 12mm x 34mm, Bronze, Pack of 10 - - Amazon.com