how to make a fishing spear

{"cid":"91198593","title":"Backoff Fishing Spear Pulling Power KN 166 Allowed Pulling Power KN 850","imgUrl":"https:\/\/img.chinax.com\/nimg\/3c\/08\/e9db12efd1acf7333af7d8bfca49-200x200-1.jpg","attrs":{"Brand Name":"ATO","Minimum Order Quantity":"1","Delivery Time":"10-15 WORK DAYS","Place of Origin":"CHINA","Payment Terms":"L\/C, T\/T","Supply Ability":"10 PIECES PER MONTH","Packaging Details":"WOODEN BOX","Size":"2 7\/8","ID mm(in)":"90.1(3 35\/64)","Allowed pulling power KN":"850","Pulling power KN":"166"}}