Straight Knurling Insert Dimond Knurling Insert Round Knurling Insert Hexagnol Knurling Insert Brass Straight Knurling PPR Insert Brass Cross Knurling PPR Insert Male Insert Female Insert Tapper Insert Open – Close Hole Insert Brass Male PPR Insert Brass Female PPR Insertt Brass Hex PPR Insert Special Features : Threads as per International Go & Not Go Standards. Deep Goove for maximum Pull Out Resistance. Inner Diameter (I/D) after Threads with very close tolerance to prevent unnecessary flush to enter into the inserts. Knurling Available : Diamond Straight Unidirectional Both blind and through inserts are available with no minimum Qty.