This is a set of three screws for mounting many of the most popular Holosun Red Dot Sights to your pistol. We include three so when you lose one on the floor you still have enough to mount your sight... (we've all been there and done that).
These ones are 8mm long M3 - 0.5. Check which length you need, or buy the "Holosun Bag of screws" we offer to cover all possibilities...
These screws use a #10 Torx bit (available separately) for install.
This length works best to attach the 407K and 507K to the Sig Sauer X Macro.