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A locking clip minimizes the movement of the plate part of the seat belt which clicks into the buckle. On some seat belts these "latch plates," as they are commonly referred to, slide freely on the belt strap and so it is necessary to use a locking clip to get as snug a fit for your child car seat. All Graco® child car seats with integrated harness systems come with a locking clip but it can be a good idea to buy an extra one or two for your other automobiles.