Upchurch Scientific® offers Extender Tools to make it easier to tighten fittings which would otherwise be too close for adequate finger tightening. The special design of these tools allows tightening without damaging a nut' s knurled head. Use our P-277 Extender Tool to tighten standard head 6-32 fittings. The N-290 Extender Tool is designed for tightening headless 6-32 and 6-40 fittings. Tighten headless 10-32 fittings with our P-297 Extender Tool.