Caldwell is a former Houston Texans third-round draft pick who started 19 of 39 career games.
He played collegiately at Alabama where he was a two-time captain.
Hills is a former Pittsburgh Steelers fourth-round draft pick from Texas.
Both players should add quality depth to the Bills' offensive line.
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Aaron Wilson covers the Ravens for The Baltimore Sun
This story originally appeared on Nationalfootballpost.com
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