This set contains 2 each 8 oz. glue bottles, one with a roller applicator and one with a biscuit slot applicator. ROLLER APPLICATOR: Apply an even and thin coat of glue just where you want it on all flat surfaces. To apply an even coat of glue to any flat surface, just squeeze the bottle while rolling the roller across the wood surface in overlapping strokes. The 8 oz. glue bottle contains a 2-1/2 inch wide rubber roller with a separate cap. Rollers can be easily cleaned with a damp cloth or by running under warm water. BISCUIT SLOT APPLICATOR: Apply glue to the inside of biscuit slots while maximizing coverage and minimizing squeeze out and clean up. To apply glue, place half-moon applicator in biscuit slot, squeeze the bottle and glue will be deposited in the center and bottom of each slot. Getting glue in the proper place increases the holding power of biscuits. The 8 oz. glue bottle contains a 2-1/2 inch wide half-moon applicator and a separate cap. Applicator is easily cleaned with a damp cloth or by running under warm water. Both applicator tips and bottles are made from nonporous polypropylene so glue can't stick. Perfect for white, yellow or liquid hide glues.