BikeService Valve Spring Compressor Kit BS9947For use during removal and servicing of engine valves and seals upon cylinder head or engine repair Supplied with 3 interchangeable adaptors of most common sizes Suitable for small and large motorcycles Durable fixed U frame features strong ACME threads Manufactured with reinforced frames from rust proofed steel Adaptor sizes: 19, 23 and 25mm Jaw depth: 110mm Jaw capacity: 20 135mm