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HM-181 4in Steel Retainer Set are used with 4in Neoprene Pads (sold separately) in unbonded capping for compressive strength testing of 4in (102mm) diameter Concrete Cylinders. They hold and confine the neoprene pads, and are placed at each end of the concrete cylinder before testing. Steel Retainers are constructed of alloy steel, precisely machined to specified dimensions and are plated inside and out to resist corrosion. Bearing surfaces are plane to within 0.002in (0.05mm). Sold in sets of 2.
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