These are made of high grade steel and are precision ground. The frame taps cut easily and fit conventional tap handles.
SB1901: 3mm x 0.5 - for rear wheel drop-out alignment screws
SB1902: 5mm x 0.8 - for water bottle, toe clip, fender and rack bosses
SB1903: 6mm x 1.0 - for cantilever brakes and large fender bosses
SB1904: 10mm x 1.0 - for derailleur hanger