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Continue to ChatKP2-FSB-6.4-RE-1 - 4NC/2NC, Brass, Bolt length 6.4mm, Rear Entry, Castell KP Bolt Interlock With Safety Switch https://www.concretespares.ie/product/kp2-fsb-6-4-re-1-4nc-2nc-brass-bolt-length-6-4mm-rear-entry-castell-kp-bolt-interlock-with-safety-switch/