Useful for hobbyists and gunsmiths alike, these replacement screw kits are appropriate for S&W 3-screw pre-1988 revolvers. The complete kit includes 3 Allen sideplate screws, Allen mainspring screw, Allen mainspring strain lock screw, trigger overtravel screw, brass plunger and Allen wrench. The sideplate screw kit includes 3 Allen sideplate screws and Allen wrench. Neither kit contains the large head front sideplate screw.