Our range of SnapOff Blade knives from Olfa, NT Cutter and Osmer offer a choice of premium quality and economic pricing. We stock a range of replacement blades to suit each knife and our range of scalpel blade shapes is extensive. It is useful to know that a scalpel blade beginning with a No. 1 will fit a No.3 handles and blades starting with a No.2 fit a No.4 handle.