12"/300mm Drum and Rotor Measuring Kit with Xtra-Value Cal Electronic Caliper Measures disc brakes and up to 12/300mm or 16/400mm on brake drums. Includes 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 contact points; 1 set of 3?4 flat contact points in plastic tube. 16/400mm Set includes 1 pair of 2 extensions. When measuring brake drums only, add 8 to measurement—allows for long cone and jaw widths. For use with 6 & 8 calipers. Range: 6/150mm. Stainless steel frame. Large easy-to-read display. Resolution: .0005/.01mm. Direct inch/metric conversion. 4-way measurement, inside, outside, depth, and step. Includes molded case 74-101-777 Prop65 information pending -