Mantis 4 locks suit PVCu single and double doors, and there is a composite door variant with a 20mm radius end faceplate. Mantis’s combination locking points pair a substantial chamfered hook and a tapered linear bolt that provide a smooth locking action. This is aided further by the inclusion of adjustable roller cams on variants for PVCu doors. These combinations lock in to newly designed one piece keeps or ‘multi-keep’ individual keeps, to provide resistance to pull out, thanks to the positioning of the screw fixings. Mantis 4 locks have been tested to PAS24:2022, and are approved for use Q-secure installations and those requiring Document Q approval.