Top Quality Stainless Steel Blind Jack Nut M6x18(0.71″), Grip Range 0~5mm(0~0.2″)Recommended hole size on application: 10mm(0.395″) 10 pcs in a bag, Stainless Steel / Clean The Blind Jack Nut is an economical blind fastener designed for assembly line use in THIN, SOFT or BRITTLE materials. When tightened, their body collapses to form legs which grip the inside of the mounting surface, leaving a permanent reusable threaded inserts. ADVANTAGE:Avoid corrosionPrevent rustSuitable for outdoor＊ PICTURE FOR REFERENCE ONLY. We also sell http://www.ebay.com/itm/322361571833