Synthes Drills We Sell the following Drills Model Numbers. Click on product image for larger image. Model #* Drill Body Diameter Overall Length Useable Length Fitting Type Description 310.11 1.1mm 65mm 35mm AO QC Twist Drill 310.15 1.5mm 85mm 60mm AO QC Twist Drill 310.510 1.8mm 100mm 75mm AO QC Twist Drill 310.19 2.0mm 100mm 75mm AO QC Twist Drill 310.20 2.0mm 85mm 70mm Jacobs Chuck Twist Drill 310.24 2.5mm 95mm 80mm Jacobs Chuck Twist Drill 310.25 2.5mm 110mm 85mm AO QC Twist Drill 310.26 2.7mm 100mm 75mm AO QC Twist Drill 310.288 2.8mm 185mm 160mm AO QC Twist Drill 310.31 3.2mm 145mm 120mm AO QC Twist Drill 310.35 3.5mm 110mm 85mm AO QC Twist Drill 310.44 4.5mm 145mm 120mm AO QC Twist Drill