720 M1 Attachment This M1 attachment is manufactured for 720 chain, Ultimate Suppliers offers 720 chain with M1 attachments in any configuration needed. We offer some of the best pricing in the industry and have teamed up with some of the industries most experienced personal to supply you with exactly what you need, when you need it, at very competitive prices. Call us or email us for inquires and experience a refreshing difference in service. Dimensions: