Whites Valve Block Tool - TriumphThe Whites Tappet Block Tool is designed to drift the tappet block in and out easily without causing damage to the engine. Compatible with most unit and pre unit 350, 500, 600 and 750 Triumph Twins from 1939 1988, a must have tool for the Triumph enthusiast. Constructed with a knurled handle to provide exceptional grip preventing slippage. Drifts the tappet block in and out Prevents damage to the engine Knurled handle for exceptional grip Compatible