StudPoP® Smart Magnetic Stud Finder – No Batteries Easy to Use: No need to mark walls or read data. Product details. Size: 25 teeth synchronous wheel 1" bore, outer diameter 45mm, thickness 22mm, fit for 15mm width synchronous belt Stud Ball Magnet Stud Ball, Magnetic Stud Finder No Batteries Stud Detector Detect Nails Screws Metal Stud Buddy Wall Scanner 27 Pounds Of Pull For 5/8" Drywall Wood & 3/4" Plywood Paneling Ceramic Tiling Rack A Tiers Stud Ball It brings much convenience for your construction. Shop 3Pcs Stud Ball Magnetic Stud Finder With 27 Pounds of Pull Magnetic Power, Stud Finder Wall Scanner, Metal Stud Finder Tool for Walls Detected... It can find studs in 5/8in thick drywall within 60 seconds. Specification: Color: red, silver Material: magnet and TPR rubber Product Size: 9 x 2 x 1.9cm/3.54 x 0.79 x 0.75 inch Package details: 1 x stud ball Note: Due to manual measurement, the size and weight may have a certain error. It’s also helpful for finding joists under carpet or in the ceiling. It’s will meet your daily construction needs. Package Content: you will get 1 piece of stud ball, which measures about 9x2x1.9cm/3.54x0.79x0.75 inch. No need to worry about batteries. This stud ball can directly locate and fix on exact location when a screw or nail head is detected.