StarTech Plastic Screw-In PCB Standoffs for Pre-Tapped PC Case - 50 Pack STANDOFF2 Allows for tool-less installation of motherboards in 6-32 threaded computer cases Plastic Screw-In PCB Standoffs for pre-tapped PC Case 50 Pack The Startech.com STANDOFF2 is the right solution for mounting your motherboard to your AT-style PC Case. This pack of 50 plastic snap-In standoffs are handy for building computer systems.