The Yale YALLP440601C Letter Plate has the following specifications: Colour: Silver. This universal-fit letterplate from Yale provides an excellent external weather seal and an internal draught seal to protect the home from the outside elements. Internal brushes reduce heat loss and an external foam seal prevents weather ingress. Its sleeve width of 254mm ensures that it can take full A4 size post without bending - a common problem for other letterplates. Internal and external thumb handles make it easy to open the flaps and it's fully sprung flaps have high endurance (tested to 40,000 cycles). The external flap is designed to open 147° for generous posting access. Supplied with a 40/40 adjustable sleeve set for door thicknesses of 38-78mm. Suitable for Timber, PVCu and Composite doors. Available in six different colours. Supplied in a visi-pack. Yale LocksA21B2018