Lot of 4 Conical Implant Drills With External Irrigation.
Diameter of all the drills are color coded :
A.  2.4 mm x 1.8 mm  (white)
B.  3.2 mm x 2.0 mm  (blue)
C.  3.7 mm x 2.5 mm  (green)
D.  4.5 mm x 2.7 mm  (black)

Depth marking on the drills for accurate drilling : 6 mm; 8 mm; 10 mm; 11.5 mm; 13 mm & 16 mm.