10Pcs 12mm/0.5'' Key Switches 220VAC/DC 3A, Barrel Lock Switch ON-Off, with 20 Keys, 10 Nuts(Double Pull), Control Switch

["The shell is made of good quality stainless steel metal, possess high hardness, high strength, high gloss.","Waterproof: Get througth professional testing, provide efficient water-proof performance.","The key switch is widely used for car modification, computer modification, access control switch, CNC machine tool, industrial control instrument.","Flame retardant base, provides an excellent flame retardant in emergency.","Single Pull & Double Pull: Single Pull means that the key cannot be pulled out when the switch is turned on. Double pull means when the switch is turned on and off, the key can be pulled out."]