TURNS DUMBBELLS INTO KETTLEBELLS IN A SNAP: Simply; open hinged handle, slide under your own dumbbellҳ grip, re-close handle. Kettle Gryp has the Patented #1 secure latching closure. Easy. Safe. Secure. COMFORTABLE SURE GRIP: Kettle Grypҳ handle is made of durable ABS plastic that is texture molded to give soft feel, yet non-slip grip for any intensity of workout. Size matches top selling cast kettlebells = Fits men's and womenҳ hands. Kettle Gryp handles are actually preferred over painted, plastic coated, or knurled handles of traditional kettlebells. PREMIUM QUALITY: Kettle Gryp is made from impact-resistant ABS plastic (Acrylonitrile Butadiene Styrene), with quality molded urethane foam inserts and stainless steel hardware. Maximum weight is 55 lbs. Works great with many popular adjustable dumbbells. LIGHTWEIGHT AND PORTABLE: At less than 1 lb, Kettle Gryps easily pack in your gym bag or carryon for use in any gym or hotel work out room so you never have to skip the most optimal work out wherever you travel. Kettle Gryp does not fit some neoprene coated dumbbells. Please see Product Description for precise measurements. ECONOMIC AND CONVENIENT OPTION: By combining Kettle Gryp with your existing traditional dumbbells, you create a top level gym experience with the full range of kettlebell type weights to enhance your workouts without spending $$$ money and without using up valuable floor or storage space.