3M™ Dual Lock™ Reclosable Fastener SJ3755 is a black, polypropylene, rigid-back, 28.5 mm diameter, die-cut piece part and a stem density of 250 stems per square inch.
3M™ Dual Lock™ Reclosable Fasteners Die-Cut Circles, Die-Cut Rectangular and Die-Cut Square Parts are primarily pre-cut parts and are supplied with a counter sunk hole for easy attachment using pan-head screws, pop rivets, ultrasonically stacked post, etc. The head of the screw or rivet must be recessed below the bottom of the mushroom stems to allow proper engagement of the mushroom heads.