• Add-on kit turns your electronic or dial caliper into a precision brake & drum measuring tool. (Does not include caliper).
• The kit will measure brake drums up to 12" in diameter.
• Includes: (1) set of clamps; (4) sets of set screws; (1) Allen wrench; (1) set of 3-3/4" contact points; (1) set of 3/4" cone(pointed) contact points and (1) set of 3/4" flat contact points. Comes in a plastic cylindrical tube.