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Automatically releases fire doors when fire alarm sounds
tapered to provide the perfect balance
High performance microphone cable
and superb sound separation ensuring that each and every sonic detail is reproduced accurately
Black Roundhead Woodscrew 4 x 20mm (Pack of 200) GY1390-32-RD-10 Automatically releases fire doors whenFor general applications into softwoods and various types of hardwood with a black passivate finish and pozi drive head. 25 sharp point and single leading thread for a fast start and improved thread acceptance. 60 twin threads with parallel shank for faster insertion and greater pull out resistance. Made from C10 18 Steel to ensure consistent quality. Size: 4. 0 x 20mm. Pack Size: Box of 200.