ITEM NAME:New 3x Hex Countersink Boring Set for Wood Metal Quick Change Drill Bit Tools OZ New 3x Hex Countersink Boring Set for Wood Metal Quick Change Drill Bit Tools OZ a.imagelink a:hover.imagelink {color:#1b0562;.Set Features all Commonly used Sizes Including 12mm, 16mm & 19mm all with 1/4" Hex Quick Change Shanks to Facilitate Fast Changing with a 1/4" Quick Chuck System. Countersink Sizes:12mm, 16mm & 19mm.