1、The blade is sharped and hard to wear,very practical. 2、Made of high-quality steel materials, durable. 3、Reasonable size, light weight, easy to store and carry. 4、Excellent workmanship, smooth surface, no scratches. 5、Easy to install and easy to use. It is a necessary part of sewing machine. Features: The blade is sharped and hard to wear,very practical. Made of high-quality steel materials, durable. Reasonable size, light weight, easy to store and carry. Excellent workmanship, smooth surface, no scratches.  Easy to install and easy to use. It is a necessary part of sewing machine. Specification: Type:5/16 ; 3/8 ; 7/8 ; 1/4 ; 9/16 ; 3/4 ; 11/16(Optional) Material:Steel Fitment:Fit for Juki 1700,761,770,772,792,781 flat buttonhole machine, 1790, 791 Size:As shown in the picture. Package List: 12 x Buttonhole Machine Blade Note: 1. As different computers display colors differently, the color of the actual item may vary slightly from the above images. 2. Please allow 1-3mm differs due to manual measurement.