1650Pc Metric Machine Screws & Nut Assortment Csk Master Kits Misc Tack Cloths ISO and Fine Pitch ISO and Fine Pitch Bottom surface of the base is hardened CA2710 Master Kit 1650PC MACHINE SCREWS & NUTS ASSORTMENT Countersunk Head 1650 Pieces Replacement Packs Available Part # Size Pack Qty CMS50 3 x 20mm 100 CMS51 3 x 50mm 100 CMS52 4 x 16mm 100 CMS53 4 x 25mm 100 CMS54 4 x 35mm 100 CMS55 4 x 50mm 50 CMS56 5 x 20mm 100 CMS57 5 x 25mm 100 CMS58 5 x 35mm 50 CMS59 5 x 50mm 50 CMS60 5 x 60mm 50 CMS61 6 x 16mm 100 CMS62 6 x 20mm 100 CMS63 6 x 25mm 50 CMS64 6 x 40mm 50 CMS65 6 x 50mm 50 CMS66 6 x 80mm 50 C300 1 M3 x 0