From The Anvil - Polished Brass 3" Heavy Duty Latch - 51741 Style_Thresholds to get anything through this

to get anything through this letter plate

Heritage Brass Cabinet Knob Florence Knurled Design with Square Backplate 32mm Polished Chrome finish - SQ4648-PC

They are CE marked and classified as follows:

Concealed Rose Euro Escutcheon to suit Round Concealed Rose Lever Door Handles

Heritage Brass Cabinet Knob Tayo Design 38mm Matt Bronze finish - C3875 38-MB

From The Anvil - Polished Brass 3" Heavy Duty Latch - 51741 Style_Thresholds to get anything through thisFrom The Anvil Polished Brass 3" Heavy Duty Latch 51741 Polished Brass Dimensions Tube Size: 78mm (L) x 23mm (H) x 15mm (T) Backset: 57mm Forend Size: 60mm (L) x 25mm (w) Strike plate: 65mm (L) x 40mm (W) A heavy duty tubular mortice latch with an extra strong spring for use with any of our knob sets or unsprung lever handles. We recommend using a 2. 5" or 3" latch with our lever handles, and a 3", 4", or 5" latch with our knob sets. Performance