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*.
Specifications
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:
DY-337.

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:
FY5318.

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:
FY5318.

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