G17-154 G17154 Castroviejo Needle Holder 5 1/2" Tungsten Carbide with Lock Straight Serrated G17-170 G17170 Castroviejo Needle Holder 5 1/2" Tungsten Carbide without Lock Smooth G17-171 G17171 Castroviejo Needle Holder 5 1/2" Tungsten Carbide without Lock Serrated