• Spring Repair Blocks .3750 - .4305 Pair (Red). • Tool used to temporarily fix a broken garage door spring so that the door can be opened and closed. • Fits common garage door brands such as: SteelCraft, Barcol, Garaga, Overhead Door, Clopay & more. • Door and Lock Surgeon Supply Calgary carries a variety of Calgary garage door spring repair blocks to meet your garage door spring block repair Calgary needs.