SANTA CLARA >> Day 1 brought a defensive end. Day 2, three more defenders. Day 3 opened Saturday with ... the drafting of another reinforcement to the 49ers’ once-gutted defense.

The 49ers took defensive tackle C.J. West with the 113th pick — 11 spots into Saturday’s fourth round.

The only other draft in 49ers history when their first five picks brought only defensive players was in 1981, when rookie defensive backs Ronnie Lott, Eric Wright and Carlton Williamson helped key their first Super Bowl-winning season.

West came across confident after his selection.

“My bread and butter is at the 1-technique. That’s where I just abuse centers, punch ’em in the face, be as violent as possible, and just cause havoc down there in the middle,” West said on a video conference call with 49ers reporters.

The 49ers paused their defensive rebuild to draft Mississippi wide receiver Jordan Watkins (fourth round) and Oregon running back Jordan James (fifth round). Then came the fastest safety at the scouting combine, Kansas State’s Marques Sigle (fifth round).

The 49ers next drafted a quarterback for the first time since Brock Purdy, and again it came in the seventh round: Kurtis Rourke, who is 10 months younger than Purdy and figures to redshirt his rookie year, recovering from ACL surgery.

Rounding out the 11-man draft class — the largest in general manager John Lynch and coach Kyle Shanahan’s nine-year tenure — were Iowa guard Connor Colby and Montana return specialist Junior Bergen.

“It was a very important draft. We haven’t been in a situation like this,” Shanahan said, referring to last month’s roster purge. “That’s why it was a little bit more nerve-wracking, because we were counting on getting a lot of guys instead of coming in there just trying to add depth. Each one felt just as important as the next one.”

One area the 49ers did not address was swing tackle, having lost Jaylon Moore in free agency to Kansas City. Pending a free agent arrival, the 49ers’ in-house options are converting Spencer Burford from guard and challenging him with Austen Pleasants.

Over the previous two days, defensive players came with all four of the 49ers’ picks: defensive end Mykel Williams (first round, 11th overall), defensive tackle Alfred Collins (second round, No. 43), linebacker Nick Martin (third round, No. 75) and cornerback Upton Stout (third round, No. 100).

West (6-foot-1, 316 pounds) transferred to Indiana last year after four seasons at Kent State. He and Collins help fill the interior’s void created by last month’s release of Javon Hargrave and Maliek Collins.

“Me transferring was to put everybody on notice that I can do what I do at every level, to show everybody I’m a player, I’m a dog and I’m violent when I play football,” West said.

Rourke texted West later Saturday to inform him they’d be staying teammates, with the 49ers using the No. 227 pick on a quarterback who says he’s in a “good spot” and will follow the 49ers medical staff’s plan for knee recovery. Despite that torn ACL in his right knee, he led Indiana to a school-record 11 wins, threw for 3,042 yards and placed ninth in the Heisman voting.