... power, safe defense, military, factory automation, medical apparatus etc. HM-M012, HM-M022 are especially distinguished as optimized design, small dimensions, smooth ... , medical apparatus etc.models explanation for capsule slip rings:HM-M012-6 HM-M022-6HM stands for company code name M ... .5ABSHM-M022-15152φ22*29.7ABSHM-M022-18182φ22*33.6ABSHM-M022-24242φ22*41.4ABS HM-M022 model Capsule slip ring