Crafted of the finest materials available to insure long, reliable service. Provides extra long life with very low noise level. Rated 2 watts. Precision construction is completely enclosed. Conductive plastic element. RV4L and 53C2 designate 5/8" screwdriver slotted shaft FMS with 1/2" split locking bushing. RV4N and 53C3 designate 7/8" screwdriver slotted shaft FMS with 3/8" long bushing. 53C1 designates 2" long round shaft FMS with 3/8" long bushing. All have 1/4" diameter shaft.* Average Shipping Weight:** 4 oz.** Specifications.** Resistance Tolerance: 100 to 1 Meg — ±10%; over 1 Meg — ±20%. ** Rotation:** 312° ±3%. ** End Resistance:** Per MIL-R-94. ** Working Voltage:** 500 VDC across end terminals. Linear Taper.