Browning Stock Minimum Bore Pulleys for "H" Gearbelts are furnished without key- seats or setscrews. They can be bored to size and furnished with key seats and setscrews at a reasonable extra price. Maximum Bores shown will accommodate Standard Keysets and Setscrew over Keyset- at. Slightly Larger Bores are possible with no Ks., Shallow Ks., or S.S. at angle to Ks.