Gary Stone, Matt Padgett, Robert Owen and Tony Newell have secured their PDC Tour cards after the third day of the Qualifying School in Wigan.
Scotland's Stone, who qualified for the UK Open last year as an amateur, beat recent World Championship qualifier Ian Ross in the last 16 before earning his Tour card with a 5-2 win over Steve Grubb.
"To have a two-year Tour Card is massive," he said. "People don't realise how big this is because of the amount of prize money there is to play for in the PDC now."
Padgett, who featured in the 2011 World Championship, regained his card with a 5-2 win over former BDO star Christian Kist.
Rookie professional Owen dropped only one leg in his last three games, while fellow newcomer Newell defied a bout of flu to whitewash Dave Ladley in their decider.
Kist and Ladley are among the players who can still earn a card via the Q School Order of Merit, which is currently led by Brian Woods.