100pcs/lot M4 external tooth magnet for led outdoor led module magnetic attraction P3 P4 P5 P6 P8 P10
https://www.vogueparade.com/shopping/EN/4004/1/1005002326424961/100pcslot-m4-external-tooth-magnet-for-led-outdoor-led-module-magnetic-attraction-p3-p4-p5-p6-p8-p10//