Available in Sizes 12, 14, 16, 18, 19, 20, 21, 22, 23 or 24. Use size 20 and up for #69 through #270 upholstery thread sizes*.
Needle System 135x17 for Upholstery or 135x16 for Leather Vinyl Industrial Sewing Machines, including most all metal heavy duty Portable Walking Foot machines

Compatible with walking foot portable upholstery machines: Reliable Baracuda 2000u33, Consew CP206R Sewing Machine, Thompson PW500/PWZ500 Walking Foot Industrial Sewing Machine. Sailrite LSZ-1 ZIGZAG Walking Foot Portable Metal Sewing Machine... - See more at: http://www.allbrands.com/search?search=walking+foot+portable#sthash.Q2j1Ix24.dpuf

Compatible with Artisan Machine Models:
29, 611, 618, 618-1SC, 797, 797AB-800/AB/ABN, 797AB LTHR/ABNS LTHR, 2618, 2698, 4400, 4400-25/LTHR, 4420, 4420-25, 6191 and SC LTHR.

Compatible with Brother Machine Models:
DB2-B727, DB2-B797, DB2-B798, LS2-B837, LS2-B877, LS2-B891, LS3-C51, LS3-C53 and LT2-B838.

Compatible with Chandler Machine Models:

Compatible with Consew Machine Models:
28, 118R, 119R, 146RB, 166R, 166RB, 206RB, 223, 224, 225, 226, 226R-1, 227, 229, 239, 244, 254, 255, 255RB, 277, 282, 288, 289, 339, 358, 382 and 389.

Compatible with Durkopp Machine Models:
147-1 and 147-2.

Compatible with Feiyue Machine Models:

Compatible with Juki Machine Models:
DNU-241, DNU-1541, DNU-1541S, LH-517, LH-518, LH-527, LH-1162, LH-1182, LK-980, LU-562, LU-563, LU-1510, LUH-521, LUH-562, MOL-100PA and MOL-100PSA.

Compatible with Mercury Machine Models:
280L and 280LS.

Compatible with Mitsubishi Machine Models:
CU-865-12, CU-865-22, DU-100, DU-110, DU-120, DY-339, DY-340 and DY-349.

Compatible with Sailrite Machine Models:
111, Big-N-Tall, Professional, Ultrafeed LS-1 and Ultrafeed LSZ-1.

Compatible with Seiko Machine Models:
CW-7, CW-7B, CW-8. CW-8B, CW-8V, LAH-1LC, LCW Class, LLW Class, LLWH Class, LPW-8, LPW-26, LPW-27, LPW-28, LSC Class, LSW Class, PW Class, STH Class, STW Class, TD-2 and TD-6.

Compatible with Singer Machine Models:
111G, 111W, 111W112, 111W151, 111W153, 138B, 153W, 168G, 168W, 211A, 211G, 211U, 211W.

Compatible with Yamata Machine Models:

Alternative Part Numbers Include 145646-0-23, SY3355, MR4, DPX17, MC-3720016-00, MC-3515016-00