Adjustable Clamping SystemSet of 4 4" Furniture & Table Risers, Extra 100mm Height. Brown Rail (Suitable for 10-37mm) Not easy to fall off. Our chair lift and table legs with adjustable rail screw clamps securely fix the frame with clamp brackets and will not fall down due to lifting and moving furniture. Unlike other furniture risers with grooves but no clamps, any small movement will cause the riser to become unstable and fall off the furniture legs. Not stackable Adjustable Width Furniture Lift with Felt Bottom Made of durable plastic Supports weights up to 10,000 pounds High density felt furniture pads protect your hardwood, tile and linoleum floors from scratches and scuffs. High density felt furniture pads protect your hardwood, tile and linoleum floors from scratches and scuffs. High load capacity They are made of durable hard plastic to support the weight of the heaviest furniture in your home or office. Reusable Suitable for most furniture legs. Don't worry about deformation,