Features and Benefits:Exclusive Heavy Duty Three Jaw Chuck eliminates the need for cones with three massive expanding jaws.;Three pieces do the work of many with a range that covers center hole diameters of 5.375?- 11.0?;The Balancer Chuck centers itself in the wheel, so an accurate mounting is achieved compared to a steep cone set-up, making it easier for the technician to assure a balanced wheel.;The Balancer Chucks centering accuracy as well as vertical stability supports wheel while clamping and unclamping.;Kit includes: 3 Jaw Balancer Chuck, 12? backing plate, and wrench key.;Convenient pockets;Exclusive Heavy Duty Three Jaw Chuck eliminates the need for cones with three massive expanding jaws.; Three pieces do the work of many with a range that covers center hole diameters of 5.375?- 11.0? ; The Balancer Chuck centers itself in the wheel, so an accurate mounting is achieved compared to a steep cone set-up, making it easier for the technician to assure a balanced wheel.; The Balancer Chucks centering accuracy as well as vertical stability supports wheel while clamping and unclamping.; Kit includes: 3 Jaw Balancer Chuck, 12? backing plate, and wrench key.