the spide insert is for CANVINS tubing spider TYPE C,CHD,E,G. We made those inserts for CANVINS tubing spider or air slips to holdon drill pipe, tubing,casing in oilwell drilling and well servicing operation, Full Circle Slip Inserts are available for Cavins “Advance” Spiders, Models“B”, “C”, “C-HD”, “E”, and “G”Hardness: 58-62.While running in or pulling out tubular at oil rigs the joints (tool ...