PCB standoff, 1)Material:nylon66 with UL 2)Flame class:94V-2 3)one side insert into PCB, the other side match with screw PCB standoffwe could provide sizes as below:PSU-6, PSU-10, PSU-12, PSU-15Fireproof Grade: 94V-2;Material: nylon66 with ULUsage: one side insert the PCB ,and the other side match with screw or tapping.