Straight Knurling Insert Dimond Knurling Insert Round Knurling Insert Hexagnol Knurling Insert Size : 3mm , 4mm , 5mm , 6mm , 8mm , 10mm , 12mm , 16mm , 20mm , 1/8″ , 5/32″ , 3/16″ , 1/4″ , 5/16″ , 3/8″, 1/2″ , 3/4″ , 1″ , UNF , BSP , Metric , UNC , UNEF , BSF , NPT , BSPT , R , G , Threads. Features : They are compact inserts suitable for insertion in all types of plastics and can be used with hot plastic Moulding and cold plastic molding . Inserts are best suitable for electrical moulded box application.