OTCs No. 4589 Disc Brake Piston Tool is an essential tool to have on hand if you work on vehicles with screw-type rear disc brake calipers. This versatile cube tool features multiple pin configurations designed to engage caliper pistons and rotate them back into the brake caliper when doing a pad replacement. Tool provides six different drive pin configurations to fit most cars and light trucks, and features a 3/8 square drive for compatibility with standard extensions, ratchets, and breaker bars. Tool features a revised configuration that fits more applications than many competitive tools. Rugged, all metal construction ensures this versatile tool will deliver reliable long-term service. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits.