Harlequins props Will Collier and Kyle Sinckler have signed new contracts with the Premiership club.
Collier, 23, has agreed a deal until the summer of 2018, while Sinckler, 21, will remain at The Stoop until the end of the 2016-17 campaign.
"They are both outstandingly talented young tight-head props," said Quins head coach John Kingston.
"I have absolutely no doubt they can go on to achieve the highest honours in the English game."
He added: "They have progressed hugely over recent seasons and I look forward to seeing the continued healthy competition between them for the number three shirt."
Collier and Sinckler came through Harlequins' academy and both players made their first-team debuts in 2011.
Collier has played 67 games for the south-west London club, while Sinckler has featured 48 times.
Sinckler played for England against Crusaders on their tour of New Zealand last summer and Collier has previously been named in England Saxons squads.