One adapter has a wing nut and the other has a socket head fastener.
2.5 LB and 5 LB Weight Stack Add On – Weight Stack Adapter Plate for Home Gym & Exercise Machines, Add Resistance to Weight S
SMRTFT NUOBELL Adjustable Dumbbells | Original All-in-One Dumbbell | Rack Only
Adapter Sleeve, Plate Adapter Sleeve with Removable End and Allen Key, Convert 1" Bars or Posts to 2" Bars or Posts, Barbell Adapter for Gym, Home(303mm/11.93in )
AnkleBell Leg Weights Adapter, Ankle Weights Adjustable Dumbbell Adapter, Single
Barbell Bar Adapter Sleeve Convert, Sleeve Olympic Adapter Sleeves with 330mm
