These high quality metal bobbins #172222 have four holes on each side. The bobbin measures 13/16 diameter and 3/8 wide.
Singer Class 66 Metal Bobbins - 1/Pack - WAWAK Sewing Supplies
DragonPoodle Studio: How to convert a Singer 99 to a hand crank
PTFE Self‑Adhesive Presser Foot Tape, with Stickiness Sewing Machine Part Presser Foot Tape, Sewing Machine Accessories Upgraded for Dressmaker
Singer Bobbin Case
Singer sewing machine bobbins made for your machine
Sewing accessories can create many professional sewing processes, which greatly improves efficiency. This product is made of high‑quality PTFE
PTFE Self‑Adhesive Presser Foot Tape, with Stickiness Sewing Machine Part Presser Foot Tape, Sewing Machine Accessories Upgraded for Dressmaker
Singer 66 Bobbins
Singer drop-in bobbin – the two horizontal hooks – Vintage Sewing
Bobbins, Cases, Tension Gauges, and Winders
Cutexinc.
Singer Sewing Machine Class 66 Bobbins Vintage Molded Steel
Cutex 20 Large Capacity Bobbins for Pfaff 541 545 1245 Class Sewing Machines : 藝術、手工藝與縫紉
Plastic Drop-In Bobbins 25PCS+ Box fit for Singer 66 Class, 99 Class, 200, 300, 400, 500, 700, 800 series and many more .The alternative part number
CKPSMS Brand -#172222P Plastic Drop-in Bobbins fit for Singer 66 99 Class Bernina 719 White 8600 8800 (25PCS+ Box)