This listing is for a Brand New Aluminum Bobbins M Size For Many Industrial Single Needle Walking Foot Sewing Machines. 

These Class M Bobbins are 1" in diameter and 3/8" thick.

These bobbins do not have winder slots.

Fits : 

Artisan : 611-AB, 618, 797AB

Brother : B745, B747, B791, B792, B797, B798

Consew : 175RB, 176R, 199RB, 205RB, 206RB

Eagle : EA-106, EA-206D, OS-2000

Feiyue : FY5318

Juki : DNU-241, DNU-1541, DNU-1541S, DSU-145, LS-246

Meistergramm : M600XL, M700XL, M800XL

Mercury : M-280L, M-280LS

Mitsubishi : DY-330, DY-337, DY-340, DY349, DY350

Nakajima : 178L, 180L, 280L, 280L, 321L, 341L, 381L, 580L, 680L

Nitaka : DY-350L, 370L

Rex : 11-155

Sailrite : 111

Seiko : STH-3BL, STH-7BL, STH-8BL

Singer : 121C300, 121C330AA, 121D300, 121D330AA, 369, 369W, 650E, 1650E

Tacony : C206RB, T155RB, T1206

Tacsew : T111-155

Taking : TK-8BL

Unicorn : DB2-H312, DY-H340, LS2-H540

Yamata : FY5318