B-Line Eaton series conduit support fasteners, 1" Height, 1" Length, 1" Width, 0.05lbs, 100 lbs vertical, 25 pounds horizontal load capacity

The BPR1 is rated for 100 lbs in the vertical direction and 25 lbs horizontally. That difference matters on the job: hung straight down off a ceiling or beam it carries four times what it will carry pulling sideways, so for horizontal runs or any lateral pull, size your spacing to the 25 lb figure rather than the 100 lb one.

It is a 1 inch cube in envelope terms: 1 inch height, 1 inch length/depth, and 1 inch width. That compact footprint is why it works in shallow plenums and tight bar joist spaces where a larger strap or clamp assembly will not sit flat.

Order it as Eaton B-Line BPR1. That is the manufacturer part number, and it is the single model this item is sold under, so there is no size or finish selection to make when you place the order.

You can use the BPR1 in both orientations, but not at the same spacing. With 100 lbs vertical and only 25 lbs horizontal capacity, a riser supported at the same intervals as a horizontal run is carrying a very different margin. Electricians typically set support intervals off the lower horizontal number so one part covers the whole job, then keep the same fastener on risers for consistency across the install.