Round Shank Bridge Reamers are designed for lining up holes in structural steel fabrication bridgework, ship construction, automotive maintenance, and railroad car manufacture. Can be used with any 1/2" 3 jaw power tool. SIZESHANK DDIA POINTFLUTE LENGTHSHANK LENGTH7/161/217/644-3/81-1/21/21/25/165-1/81-1/29/161/23/85-1/81-1/25/81/215/646-1/81-1/211/161/213/327-1/81-1/23/41/215/327-3/81-1/213/161/235/647-3/81-1/27/81/239/647-3/81-1/215/161/243/647-3/81-1/211/247/647-3/81-1/21-1/161/213/167-3/81-1/21-1/81/255/647-3/81-1/21-3/161/269/647-3/81-1/21-1/41/263/647-3/81-1/21-5/161/21-1/167-3/81-1/21-3/81/21-1/87-3/81-1/21-7/161/21-3/167-3/81-1/21-1/21/21-1/47-3/81-1/2