StarTech Plastic Snap-In M3 Motherboard Standoffs for AT Computer Case - 15 Pack 15STANDOFF Allows for tool-less installation of motherboards in computer cases Plastic Snap-In M3 Motherboard Standoffs for AT Computer Case - 15 Pack This pack of 15 plastic snap-In standoffs are handy for building computer systems, especially mounting your motherboard to your AT style PC Chassis.