steel formwork system u shape clip, u clip spring nut, u clip/u-clip/u clip hook Specifications 1. diameter;12mm,16mm 2. weight:160g 3. package:woven bag or according customer requirements 4. OEM offer U clip fastener 1. concrete formwork u clip 2. diameter;12mm,16mm 3. weight:160g 4. used with concrete formwork 5. 169 pcs/bag or according customer requirements