Description: Telescopic design makes it compact for easy storage and allows you to adjust the rod length as needed. Sponge handle design makes it shockproof and comfortable to grip. Our product can be used to gently tap the wall to determine the scope of the cavity wall. It is constructed of metal material. We have 2 sizes for you to choose. It is suitable for home. Item Name: Hollow Test Hammer Material: Metal Features: High Strength, Good Toughness, Wear Resistant Size Details: S Expand Length: 130cm/51.22" (Approx.) S Unexpanded Length: 25cm/9.85" (Approx.) L Expand Length: 200cm/78.8" (Approx.) L Unexpanded Length: 27cm/10.64" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Hollow Test Hammer