I too cut on glass and use a lot of #11 blades. But I also bought a couple of scalpel handles and 100 scalpel blades online for under $20.00. They were actually cheaper than Xacto blades. The scalpel blades are numbered the same as hobby blades and are much, much sharper. The only problem I have is that the scalpel handles are flat and do not feel as comfortable as the round hobby handles.