JBF National poly pad leveling pads are manufactured using high quality glass fiber reinforced nylon to ensure durability. To maximize corrosion protection the stud and ball assembly are manufactured using grade 303 stainless steel. The removable bolt hole caps these levelers feature makes securing machinery to the floor no problem at all, regardless of surface and placement area conditions. Inch and metric versions, and various stud lengths available. Non-skid pad models available.