Qualarc LSF-LS10CHB Liberty Aluminum Adjustable Mail Chute Letter Slot Suitable for 8" to 10" Walls Liberty chutes may be purchased separately for installation into front doors, garage doors or masonry walls This chute is suitable for 8 to 10 inch walls dimensions 12"w x 4.5"H x 10"d, 10 lbs Compatible with liberty letter plates incoming slot opening: 9.5"W x 2.5"H Manufactured in England Liberty chutes may be purchased separately for installation into front doors, garage doors or masonry walls This chute is suitable for 8 to 10 inch walls dimensions 12"w x 4.5"H x 10"d, 10 lbs Compatible with liberty letter plates incoming slot opening: 9.5"W x 2.5"H Made of solid aluminum. Will not rust.