3 detachable springs to help better maintain tension._x000D_ Essential tool for starting a string job and to extend short string._x000D_ Rubberized handles provide grip and comfort._x000D_ Dismountable springs,clamp strength can be adjusted._x000D_ The Starting Clamp is made of heavy duty steel._x000D_ Features:_x000D_ Available net feather line; horizontal line stop line; when not knotted, clip to the racket frame instead of the line clip; large clamping force does not hurt the line_x000D_ When knotting, it can be used to repair too short ball lines; it can avoid knotting and hurting hands_x000D_ Colour:Red_x000D_ Material:Aluminum_x000D_ Size:13.6*7.6*2.6cm_x000D_ Package Contents:_x000D_ 1xtennis Racket stringing machine_x000D_ Only the above package content, other products are not included._x000D_ Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. 3 detachable springs to help better maintain tension. Essential tool for starting a string job and to extend short string. Rubberized handles provide grip and comfort. Dismountable springs,clamp strength can be adjusted. The Starting Clamp is made of heavy duty steel. Features: Available net feather line; horizontal line stop line; when not knotted, clip to the racket frame instead of the line clip; large clamping force does not hurt the line When knotting, it can be used to repair too short ball lines; it can avoid knotting and hurting hands Colour:Red Material:Aluminum Size:13.6*7.6*2.6cm Package Contents: 1xtennis Racket stringing machine Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.