This CRL Wood's 10" (254 mm) Diameter Vacuum Cup is available with a heavy-duty metal handle. They have deep, concave pads for easy attachment on curved or irregular non-porous surfaces. Not for use on thin, fragile materials. The minimum radius for curved loads is 13" (330 mm). Low Vacuum Audio Alarm supplements visible red-line indicator with an audible indicator, increasing peace of mind in circumstances that make it difficult to monitor the visual indicator. Advanced design automatically turns Audio Alarm on or off as necessary, eliminating power switch, increasing battery life, and simplifying operation. Release valve lever permits quick and complete release. Supplied with protective Carrying Case.