ST100.00 Basic Instrument Set for 3.5mm & 4.5mm Screws Contents ST003.02 : Drill Bits (s.s. Quik Coupling End) 2.5mm : 1 no ST992.04-07 : Drill Bits (s.s.) : 2.5 & 3.5 : 2 nos. each ST903.02 : Counter Sink For 6mm : 1 no ST303.00 : Tap Handle : 1 no ST203.04 : Tap : 3.5mm Cortex : 2 nos ST203.05 : Tap : 3.5mm Cancellous : 1 no ST203.06 : Tap : 4mm Cancellous :1 no