the Part Name is 1/4" double pipe clamps material:iron sheet size:all size best price with best quality

1.material:iron sheet

2.the thread pitch of hex nut is 1/4" 

1/4"double pipe clamp

reference	Dmm	pcs/box	box/carton	A*Bmm
700001	12	100	10	12.5*1.2
700002	15	100	10	12.5*1.2
700003	18	100	10	12.5*1.2
700004	22	100	10	12.5*1.2
700005	28	100	10	12.5*1.2
700006	35	100	10	14*1.2
700007	42	100	10	28*1.2

1/4"double pipe clamp