The one I have will cut up to 1/2 inch. I have use some that are about 3/8" but they are thick and harder to use. I find most of mine are about 3/16 inch and usually I stick to 50 lbs. strength. I don't see any need to go to a stronger tie and think 40 lbs. would probably be sufficient. I buy the 14.5 inch length and then hook a couple together when needed. With a bit of planning you can save one when removing after the glue up. I know some feel the cost (.07 to .14 cents) per ring is costly when compared to one time price of ring clamp. I think the ease in use and no nob offset is worth the $2.00 to $5.00 cost especially when you figure in the cost of wood, tools, glue and time.