This Redwood Internal Door Casing Set is designed for internal door openings where a deeper lining is needed to suit the wall thickness. With a finished section of 33 x 169mm, it provides a wider frame depth than the smaller casings in the range. The nominal timber size is 38 x 175mm, making it suitable for joinery projects where these dimensions are specified. Manufactured from redwood softwood, the casing provides the framework for fitting and hanging a compatible internal door. It can be cut and fitted to suit the opening, subject to the overall dimensions of the supplied set.