1.material:aluminum 2.size:20mm-25mm 3.standard:BS 4.type:all types can be available BS Aluminum Electrical Circular Junction Box1) Aluminum material,more cheaper2) With BS thread, can be supply3) Can be supply the 3/4" and 1" standand sizes4) 3/4" is 25mm hight,1" is 30mm hight of the box5) Better than malleable circular box6) Switch box will two pulling holes7)size: 20mm 25mm 8)Terminal No. ...