Ultradyne USA, UD Single Thumb Rest Grip, Fits UD Chassis Systems, Cerakote Finish, Black, ASA Thermoplastic, Right Hand NEW Compatible with UD Chassis Single Thumb Rest 1.5 oz ASA Thermoplastic Product Description The UD Single Thumb Rest Grip is designed and built for consistent accuracy. The wrist is naturally aligned with the mostly upright grip angle. The thumb rest provides comfortable and steady support for all shooting situations.