Here’s a list of the players 20 different mock drafts have the Steelers taking. The majority think they are going D with 10 picks and only 5 on O. The players on the most drafts were Donte Hightower (props to Dee Dub for the early mention) with 5 drafts followed by Dontari Poe listed on 4 drafts. Cordy Glenn was listed twice. The other 9 had different players. Heights and weights are from the drafts or a quick Google (I know they can vary depending on site).

Hopefully gives you some names to check out:

D:
Donte Hightower – MLB – 6’4”/258 – Bama (5 drafts)
Dontari Poe – NT – 6’5”/350 – Memphis (4 drafts - Kiper had Poe)
Vontaze Burfic – MLB – 6’3”/250 – Az St
Keeston Randle – DL -6’5”/295 – Tx
Brandon Thompson – DL – 6’2”/310 – Clemson
Chase Minifield – CB – 6’/188 – VA
Alemeda Ta’Amu – DL – 6’3”/335 – Wash
Janoris Jenkins – CB – 5’10”/185 – N. Alabama (played at UF for a few seasons)

O:
Cordy Glenn – OG – 6’4”/331 – Georgia (saw him listed as big as 6'5"/340's)
Kelechi Osemele – OG – 6’5”/347 – Iowa St
Coby Fleener – TE – 6’6”/240 – Stanford
Michael Floyd – WR – 6’/229 - ND