Features 1、Applicable Model: Piston driver, direct replacement for HITACHI NV83A NV83A2, please confirm the model carefully to ensure precise fit. 2、Part Number: Manufactured according to strict original specifications, this piston driver assembly reference part number is 878 428. 3、Main Function: Locking mechanism which will not allow the driver to unscrew from the piston. Aluminum is crimped into the unilock grooves of the shaft to prevent unscrewing. 4、Durable Construction: Aerospace grade aluminum pistons and heat treated tool steel provide high strength for long lasting durability. 5、Direct Replacement: This nailer piston driver matches the fit and function of the factory part on specified models, is a reliable replacement part. Specification Item Type: Piston Driver Material: Aluminum, Steel Reference Part Number: 878 428 Fitment: Replacement for HITACHI NV83A NV83A2 Package List 1 x Piston Driver Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.