The Meritor AxleTech 66864B is a 16.5 x 7 inch brake drum with an outboard, 10-hole mounting configuration. It is machine-to-balance per TMC RP608. Sold by Pro Gear and Transmission as a genuine Meritor AxleTech part. Call us to confirm proper fit for your axle before ordering.Features16.5 x 7 inch drum sizeOutboard mounting with 10-hole configurationMachine-to-balance per TMC RP608Tech SpecsDrum Size: 16.5 x 7 in.Mounting: Outboard, 10-holeBalance: Machine-to-balance per TMC RP608