Klein Grips for PVC Covered Conductors have the following features: Serpentine jaws are specially machined to allow insertion on insulated conductor through the jaws. This reduces the danger of slippage which might result in insulation damage. Eliminates stripping insulation from the conductor. Round inside jaw contour. Comes in 4 sizes. CAT. NO. 1659-20: Min .20″ to Max .42″, Max load 4500 lbs., Jaw 4 3/16″, Weight 3 lbs.CAT. NO. 1659-30: Min. .31″ to Max .50″, Max load 4500 lbs., Jaw 4-3/4″, Weight 3.75 lbs.CAT. NO. 1659-40: Min. .49″ to Max .79″. Max load 8000 lbs., Jaw 5-11/16″, Weight 7.75 lbs.CAT. NO. 1659-50: Min. .79″ to Max 1.01″, Max load 8000 lbs., Jaw 5-11/16″, Weight 7.75 lbs.