Check the listing for details. Flex Shank Installer Drill Bit Guide Tools/Cable Bumper Balls for 3/16".... Color: Does not apply, Condition: New. Listed at 14.76 USD. Flex Shank Installer Drill Bit Guide Tools/Cable Bit Bumper Balls for 3/16" Shank/in-Wall Drill Guide Kit 1-3/4" & 2-5/16" - S/4+Tool Product Details Package Dimensions : 5.08 x 3.11 x 2.28 inches; 3.53 ounces Item model number : HT-40 Manufacturer : QZATTCAEN Material: Stainless Steel Finish Type: Stainless steel Shank Type: Straight Brand: QZATTCAEN Tool Flute Type: Straight 【Special Design】This Flex Shank Installer Drill Bit Guide Tool kits is designed for guide the flex shank drill bit to keep straight during working. 【Application】This In-Wall Drill Guide Kit is suitable for using in narrow and long space, some out of sight places within the wall. Insert the flex shank bits into the PVC bumper ball, fasten the stopper to keep ball in the top position, then it can works. 【Value Package】This drill bit Guide kits include: 1pc 1-3/4" diameter PVC ball, 1pc 2-5/16" diameter PVC ball, 1pc 3/8" stopper, 1pc L-shape wrench to adjust stopper. Two different size balls can be used in different working condition base on your needs. 【Materials】The two bumper balls are made of PVC, and the stopper is made of stainless steel. 【Dimension】L Ball Dia: 2-5/16"; S Ball Dia: 1-3/4"; Stopper Width x Thickness: 3/8" x 1/8"; L-Shape Wrench Length: 3-1/8" x 3/4".