GBC CombBind C250 Pro Manual Binder White IB271403 Ideal for medium to high volume use, the CombBindÆ C250Pro is a robust and durable comb binder. Selector pins allow you to adjust for any paper size up to A4 and you can also alter the margin depth. Easy to use and with a large capacity clippings tray, it can punch up to 20 x 80gsm A4 sheets and bind up to 450 sheets using 51mm spines.