6mm Head Pins, Zzinc plated with plastic cap or flute washer, "K" is Knurled shank for steel

Part No.  Shank length     Overall length      Shank dia.  
H50 (K) 3/4"     23mm      3.7mm
H51 1" 28 3.7
H52 1-1/4" 35 3.7
H53 1-1/2" 41 3.7
H54 2" 54 3.8
H55 2-1/2" 67 3.8
H56 3" 79 3.8
H57 3-1/2" 92 3.8
H58 4" 104 3.8

Applications

For PAT EXP660 with Ø6mm barrel