Enantiomers or Diastereomers? The key tells me these are enantiomers. 



I however don't think they are; their chiral carbons' configurations aren't inverted - i.e. only one chiral carbon's R/S configuration changes! This suggests diastereomers to me! Plus the Sawhorse projections I draw don't seem to be mirror images.
They are diastereomers.  Both of the "front" chiral carbons (the one with the bromine attached) are "S".  Rotate the one on the right 120 degrees CCW and it is identical to the one on the left.  But the "back" carbon (the one with the hydroxyl attached) is "S" on the left figure and "R" on the right figure - diastereomers.