This item is sold through the Groupon Store R Boutique, operated by Migliori Products INC. The merchant is solely responsible to purchasers for the fulfillment. Japanese bar clamps are not designed to develop a lot of pressure, so they can be lightly constructed with eye-pleasing lines. The clamping depth is limited, so the workpiece normally lies directly on the polished bars, allowing precise clamping while making it less likely the. Clover Clamps were invented in Japan by seamstresses. They have a unique property in that, the more the clamps are pulled on, the tighter they squeeze. Buy Black Japanese Clover Clamps on lodgeontheroaringfork.com ✓ FREE SHIPPING on qualified orders. These are the classic Japanese clover clamps, one of the most widely used nipple clamps in BDSM play. Sold separately for use in your own bdsm designs. Miter Max Corner Clamp. $ Add to Cart. Compare. 5" Brass Modelmaker's Clamps Quick View. W-Y-HATAKIN 5" Brass Modelmaker's Clamps. $.