Businesses in the cement, lime and plaster category manufacture, process or supply materials used in construction, building maintenance and repair. Their products may include cement in bags or bulk, ready-mixed or specialist mortars, hydrated and hydraulic lime, gypsum plaster, plasterboard compounds and other dry building mixes. Some firms focus on production, while others distribute materials from several manufacturers to builders, contractors, merchants and household customers. Services can include handling and delivery of bagged or bulk materials, advice on selecting products for particular applications, and technical information on mixing, preparation and use. Cement and lime are commonly used in concrete, mortar, render and conservation work; plaster products are used to coat walls and ceilings, form finishes and support internal repairs. Product ranges and services vary, and may cater for new construction as well as traditional buildings requiring compatible materials.