This extra large driver set allows you to build your own custom bushing driver. Select the required sizes and assemble your driver tool. Discs are connected with a shaft and screw which connects to the driver handle. Build to suit the required seal bush or bearing job. Discs size: 70mm through to 150mm in 5mm increments. Please also check our ebay store:http://stores.ebay.com/topautotoolsClick here to visit our ebay store! We Accept PayPal .