Includes: 1 Brass Sleeve with a 4 equal side taper, 3/8\" Outside Diameter and 1.18 Inside Diameter, 1-1/8\" long 1 Brass Sleeve with a 4 equal side taper, 3/8\" Outside Diameter and 1.7 Inside Diameter, 1-1/8\" long 2 Quick Change Drill Bits #56 (1.18mm) 2 Quick Change Drill Bits 1.7mm