This 41 in long boom kit includes 2 mini clamps --- one with a with double ended stud, and a 3 lb counterweight.
The stud has a 5/8 in stud with 1/4-20 in threads on one end, and a 5/8 in stud with 3/8 in threads on the other.
Manfrotto 2941 Mini Clamp
The Manfrotto 2941 Mini Clamp is a lightweight and sturdy clamp, which ftis on tubes up to 1-1/8" thick.
Manfrotto 173B Mini Boom Arm Only - Black
The Manfrotto 173B Mini Boom Arm Only is made of black anodized aluminum, and is a boom arm only, with no swivel mount or counterweight. Provided with 5/8" stud with 1/4-20 and 3/8" threaded tips.
Comes with a 5/8" standard stud 1/4-20 tip on one end and 3/8" on the other.
Manfrotto 172 Counter Balance Weight - 3 lbs
The Manfrotto 172 Counter Balance Weight is a 3 lbs (1.4kg) counterweight that clamps on tubes 13 to 30mm thick.
Manfrotto 171 Mini Clamp
The Manfrotto 171 Mini Clamp is a handy mini clamp that can be used in a myriad of ways around the studio or on location. Lightweight and sturdy, it can clamp onto tubes with a maximum diameter of 1.38" (35mm), and has a load capacity of 2.2 lbs (1kg). It also features a 5/8" (16mm) socket at its base.